Ash: Support "Next Song", "Previous Song", "Play/Pause" Multi Media buttons

chrome/browser/chromeos/extensions/media_player_event_router.h

Index: chrome/browser/chromeos/extensions/media_player_event_router.h
diff --git a/chrome/browser/chromeos/extensions/media_player_event_router.h b/chrome/browser/chromeos/extensions/media_player_event_router.h
index aaaafb1a7204f3cd74729bf4eb96453234f5af4e..6fb76efbc052d237a0bd19e044721d03abf9ecf9 100644
--- a/chrome/browser/chromeos/extensions/media_player_event_router.h
+++ b/chrome/browser/chromeos/extensions/media_player_event_router.h
@@ -17,8 +17,18 @@ class ExtensionMediaPlayerEventRouter {
 
   void Init(Profile* profile);
 
+  // Send notification that next-track shortcut key was pressed.
+  void NotifyNextTrack();
+
+  // Send notification that playlist changed.
   void NotifyPlaylistChanged();
 
+  // Send notification that previous-track shortcut key was pressed.
+  void NotifyPrevTrack();
+
+  // Send notification that play/pause shortcut key was pressed.
+  void NotifyTogglePlayState();
+
  private:
   Profile* profile_;